*,
*::before,
*::after {
    box-sizing: border-box; /* 修改默认盒模型 */
    -webkit-text-size-adjust: 100%; /* IOS 横屏时默认字体为140%；旋转屏幕时，字体大小不变 */
    -webkit-tap-highlight-color: rgba(0, 0, 0, 0); /* 修正 IOS 和 Android 可点击元素的高亮颜色 */
    -webkit-tap-highlight-color: transparent; /* i.e. Nexus5/Chrome and Kindle Fire HD 7'' */
    -webkit-touch-callout: none;
}

/**
 * 尽可能使用系统原生字体，PC上很多字体手机端并没有，保留Arial用于PC端调试;
 */
html,
body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

/* 清除内外边距 */
body,
h1,
h2,
h3,
h4,
h5,
h6,
hr,
p,
blockquote,
dl,
dt,
dd,
ul,
ol,
li,
th,
td,
pre,
fieldset,
lengend,
button,
input,
textarea {
    margin: 0;
    padding: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: normal;
    line-height: 1.4em;
}
h1 {
    font-size: 2em;
}
h2 {
    font-size: 1.4em;
}
h3 {
    font-size: 1.2em;
}
h4,
h5,
h6 {
    font-size: 1em;
}

/**
 * 重置标签元素
 * 1. Remove the gray background on active links in IE 10.
 * 2. Remove gaps in links underline in iOS 8+ and Safari 8+.
 * 3. 当在iOS上触摸并按住一个元素的时候，Safari会展示一个关于这个链接的callout信息。禁用该属性。
 */
a {
    text-decoration: none;
    background-color: transparent; /* 1 */
    -webkit-text-decoration-skip: objects; /* 2 */
    -webkit-touch-callout: none; /* 3 */
    color: inherit;
}

img {
    -webkit-touch-callout: none; /* 见 <a> */
}

/* 重置列表元素 */
ol,
ul {
    list-style: none;
}

/* 重置表格元素 */
table {
    border-collapse: collapse;
    border-spacing: 0;
}

div {
    border: none;
    box-shadow: none;
}

/* Add the correct display in IE 9-.*/
article,
aside,
footer,
header,
nav,
section {
    display: block;
}

/* 统一等宽字体 */
code,
kbd,
pre,
samp,
tt {
    font-family: 'Courier New', monospace, Courier;
}

/**
 * 1. Remove the bottom border in Chrome 57- and Firefox 39-.
 * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
 */
abbr[title] {
    border-bottom: none; /* 1 */
    text-decoration: underline; /* 2 */
}

/* reset the correct font weight in Chrome, Edge, and Safari. */
b,
strong {
    font-weight: bolder;
}

/* Add the correct background and color in IE 9-.*/
mark {
    background-color: #ff0;
    color: #000;
}

/* Add the correct font size in all browsers.*/
small {
    font-size: 80%;
}

/**
 * Prevent `sub` and `sup` elements from affecting the line height in
 * all browsers.
 */
sub,
sup {
    font-size: 75%;
    line-height: 0;
    position: relative;
    vertical-align: baseline;
}
sub {
    bottom: -0.25em;
}
sup {
    top: -0.5em;
}

/**
 * Add the correct display in IE 9-.
 */
audio,
video {
    display: inline-block;
}

/* Hide the overflow in IE. */
svg:not(:root) {
    overflow: hidden;
}

/* Add the correct display in IE 9-. */
canvas {
    display: inline-block;
}

/* Add the correct display in IE. */
template {
    display: none;
}

/* Add the correct display in IE 10-.*/
[hidden] {
    display: none;
}

/* Correct the padding in Firefox. */
fieldset {
    padding: 0.35em 0.75em 0.625em;
}

/**
 * 1. Add the correct display in IE 9-.
 * 2. Add the correct vertical alignment in Chrome, Firefox, and Opera.
 */
progress {
    display: inline-block; /* 1 */
    vertical-align: baseline; /* 2 */
}

/* ------------------Form------------------ */
/**
 * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
 *    controls in Android 4.
 * 2. Correct the inability to style clickable types in iOS and Safari.
 */
button,
html [type="button"], /* 1 */
[type="reset"],
[type="submit"] {
    -webkit-appearance: button; /* 2 */
}
/* Remove the inner border and padding in Firefox. */
button::-moz-focus-inner,
[type='button']::-moz-focus-inner,
[type='reset']::-moz-focus-inner,
[type='submit']::-moz-focus-inner {
    border-style: none;
    padding: 0;
}

/* Restore the focus styles unset by the previous rule. */
button:-moz-focusring,
[type='button']:-moz-focusring,
[type='reset']:-moz-focusring,
[type='submit']:-moz-focusring {
    outline: 1px dotted ButtonText;
}

/**
 * 1. Add the correct box sizing in IE 10-.
 * 2. Remove the padding in IE 10-.
 */
[type='checkbox'],
[type='radio'] {
    box-sizing: border-box; /* 1 */
    padding: 0; /* 2 */
}

/* Correct the cursor style of increment and decrement buttons in Chrome. */
[type='number']::-webkit-inner-spin-button,
[type='number']::-webkit-outer-spin-button {
    height: auto;
}

/* 取消chrome下默认的文本框聚焦样式 */
input,
textarea {
    outline: none;
}

/* 移除 chrome 自动补全时黄色背景 */
input:-webkit-autofill {
    -webkit-box-shadow: 0 0 0 30px white inset;
}

/* 修改占位文字的默认样式 */
input::-moz-placeholder,
textarea::-moz-placeholder {
    color: #cccccc;
}
input:-ms-input-placeholder,
textarea:-ms-input-placeholder {
    color: #cccccc;
}
input::-webkit-input-placeholder,
textarea::-webkit-input-placeholder {
    color: #cccccc;
}
